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The reason for the issue that you have right now with your Cyberpower 525SL is a bad battery. This means that some of the battery relay's component or relay has failed. You may contact the manufacturer if it's still under warranty. If not you may check this site they do have battery for your machine.

the input power is bad (outlet) it could mean your phase and neutral are backwards. What country are you in? If in USA home depot or lowes sells cheap outlet tester that let you know right away what wire is wrong

I have the exact same issue with my 525SL.
When you push in the red button - the green power light comes on for
about 5 seconds = then the light goes out and the device plays a single
long beep for about 5-8 seconds.

Given the dialogue here - I took out the battery and bough a brand new
BB replacement battery and returned it into the unit as it should. The
device continues to have the same behavior.

So it is NOT always a new battery that will fix the system.
Don't jump into spending $30.00 for a replacement.
Look into this further or you'll wind up wasting your money.

I have the same problem.
It is most likely the battery.
I tested my battery on a Shumacher trickle charger, and the battery wouldn't hold a charge.
This is a common problem with UPS systems that use sealed lead acid batteries.
The longest life that you can expect with these types of batteries is 5 years MAX.
The battery can be replaced with a Radio Shack 12V/7200mAh Lead-Acid Battery
Model: CNB-GP1270F2 | Catalog #: 23-9030
Here is the link for the UPS users manual.
http://www.cyberpowersystems.com/user-manuals/CP550SL_UM.pdf
To replace battery, (unplug AC cord), turn the UPS upside down on floor or workbench.
Remove the 6 deeply recessed phillips screws, then pull the bottom off.
Remove the wire leads from the old battery (pull on the connectors, not
the wires). Install new battery (red wire to red or + sign) and replace
the bottom and screws. Careful, tighten the screws finger tight
(plastic strips easily).
Plug in UPS and you should be good to go.
Hope this helps